Shuten-Douji, known for being one of the Big Three Youkai of Japanese mythology and having an amazing voice, bows in as a high-utility support Assassin. Her active skills include a universal Charm (effective on all enemies), a party-wide attack boost, and Guts for survivability. Her AoE Noble Phantasm is also notorious for applying a multitude of debuffs: skill seal, poison, and reduction of enemy attack, defense, debuff resistance, NP damage, and critical attack chance.

Shuten’s high hitcounts coupled with her class and QQAAB kit also allow her to generate a good amount of stars while charging her NP quickly at the same time. Her Arts NP in addition to her solid generation stats allow her to synergize well with Arts teams. Despite having the highest attack of all Assassins however, the low Assassin attack modifier hurts her damage output. Nevertheless, Shuten’s utility and niche as an AoE Assassin makes her an excellent addition to one’s Chaldea. (Plus, she’s going to be the only *good* AoE Assassin to be released for a while.)

Strengths

Great Overall Utility

Shuten arguably has one of the better support kits among Assassins and Arts Teams in general. Her first skill, Intoxicating Aroma of Fruits, not only reduces the defense of enemies, but also has a chance to Charm them regardless of their gender. As the Charm can affect Servants as well, she can be included in boss fights. Her second skill, Demonic Nature of Oni, gives both a party-wide attack buff and a boost to her NP damage. She also has Guts for survivability in her third skill. Shuten’s NP is the best example of utility as it debuffs the opponent in five different ways (reduction of enemy attack, defense, debuff resistance, NP damage, and critical attack chance) as well as sealing their skills for a turn and poisoning them.

Good NP and Star Generation

With her great star generation, high hitcounts (6 Extra Hits!), and QQAAB kit, Shuten does great at both generating stars and NP at the same time. An AQQ Brave chain both can charge Shuten’s NP and give out stars. As she also has relatively higher star weight (being an Assassin), she can also use those stars she generated to supercharge her NP via crits. Shuten can also perform an NP Arts Brave chain to allow her to refill her NP gauge quickly.

Good Kit Synergy

Aside from the fact that her skills have great utility, they also synergize with each other well. Intoxicating Aroma of Fruits gives a defense down, while Demonic Nature of Oni increases her NP damage and party attack,

Weaknesses

Low Damage

Shuten actually has the highest attack stat compared with her other 5-Star Assassin counterparts; however with the 90% attack modifier of Assassin classes, her attack is drastically lowered, preventing her from dealing heavy damage. For example, Altria Pendragon has a higher base attack than Shuten when attack modifiers are taken into account.

NP Skill Seal is Double-Edged

While Shuten’s NP’s skill seal is useful for at times (e.g. preventing enemies from charging their NPs for a sudden surprise NP turn), it can backfire when an enemy who would otherwise use a skill, kills a low health Servant instead.

Another Ending : Shuten can dish out critical damage, and is primarily an Arts-based damage dealer. Another Ending helps fulfill both of those niches.

Formal Craft / Projection : As mentioned, Shuten is mainly an Arts-damage dealer, so she can both increase her damage and NP gain by increasing her Arts performance.

Prisma Cosmos / A Fox's Night Dream / Beasts Under the Moon : Shuten primarily wants to be able to use her NP as much as possible, and these CEs help her increase her NP gain. While all three help Shuten charge her NP faster, A Fox's Night Dream and Beasts Under the Moon also helps her generate stars as well.

Intoxicating Aroma of Fruits A, while Shuten’s defining skill, is best maxed out second due to the Charm chance being the same regardless of level. The defense down debuff scales similarly to the attack increase buff her Demonic Nature of Oni A has, so Demonic Nature of Oni should be prioritized instead as it gives both a party-wide attack boost, and a NP buff to Shuten.

Battle Continuation A+ can be leveled last, as the survivability doesn’t provide as much utility as her other skills.

Deals damage to all enemies.
Reduces their debuff resistance by 10% for 3 turns.
Reduces their defense by 10% for 3 turns.
Reduces their attack by 10% for 3 turns.
Reduces their NP damage by 10% for 3 turns.
Reduces their critical attack chance by 10% for 3 turns.
Seals their skills for 1 turn.